compositor: remove incorrect idle timer initialization
compositor: remove incorrect idle timer initialization

weston_compositor_create() should just create idle timer but not arm it,
because idle-time setting is not ready at this point.

Remove idle timer first update in weston_compositor_create() since
idle_time variable is not set at this point. Idle timer is armed
properly later in weston_compositor_wake().

Signed-off-by: Egor Starkov <8b901b5936353ddf0acbbcd40a221210a7c77a6f@ge.com>
[Pekka: tweaked commit message]
Reviewed-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

Fantu/compositor-spice,giucam/weston,kwm81/weston,krezovic/weston,sir-murray/weston,kwm81/weston,giucam/weston,sir-murray/weston,krezovic/weston,Fantu/compositor-spice,Fantu/compositor-spice,Gnurou/weston,Gnurou/weston